Consolidated 1900/P Series Safety Valves Instruction Manual
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Notes:
A.
It’s a good policy to keep parts together by valve serial
number. Serial number and valve type number are
stamped into the top edge of the outlet flange and on the
valve nameplate.
B.
For parts identification refer to Figures 1-8
The Consolidated 1900/P series safety valve can be
disassembled by following the procedure outlined below:
1. Remove cap (including lifting gear) and cap gasket.
2. Remove adjusting ring pin and gasket. If the existing
blowdown is to be restored upon reassembly, the
position of the adjusting ring with respect to the disc
holder must be determined. Turn the adjusting ring
counterclockwise, i.e., move notches on the adjusting
ring from left to right. Record the number of notches
passing the ring pin hole required for the ring to contact
the disc holder. This information will be used in setting
the ring upon reassembly of the valve.
3. Use dial caliper or depth micrometer to measure and
record dimension "A" of Figure
10 from the top of the
spindle to the top of the adjusting screw. This will be
used later for adjustment of the valve to near its original
set pressure. Loosen the adjusting screw lock nut. Turn
adjusting screw counter-clockwise to remove the spring
load. When turning the adjusting screw use Vise-Grip
®
pliers to hold the spindle.
4. Remove the stud nuts and lift off the bonnet or yoke.
Remove bonnet gasket.
5. Remove the spring and spring washers. The spring and
spring washers should be kept together as a unit at all
times.
6. All the upper internal parts can be removed as a unit by
lifting out the spindle
(1)
. These parts should be removed
by lifting straight up. On bellows valves care should be
taken not to bend or distort the bellows or its flange.
Care should be taken to ensure that disc and spindle
assembly are fully engaged before removal.
7. Remove the spindle from the disc holder. In valves as
shown in Figures 1 to 7, it is necessary to rotate the
spindle counter-clockwise only, while pulling up. This
engages the drop-out thread.
8. Remove guide from the disc holder.
9. On D and E valves, remove the limit washer and tag
with the valve serial number. If bellows D or E, tilt the
disc holder bellows assembly and slide out the limit
washer. The bellows is attached to the disc holder by
right-hand threads. Apply a pin spanner wrench to the
bellows ring and loosen bellows by turning counter-
clockwise (Figure
11). The bellows convolutions are
very thin metal and care should be taken to protect
them from damage at all times. Remove bellows gasket.
10. Remove disc holder retainer ring using inside snap ring
pliers (see Figure
29).
11. Separate disc holder, disc and holder ring.
12. Remove the adjusting ring from the nozzle by turning
counter-clockwise and tag with valve serial number.
13. The nozzle should not be removed from the base
unless necessary due to damage.
(1)
In instances where valves are fouled with foreign materials
and/or heavy products, disassembly may be eased if
these parts are given a prior soaking in a suitable solvent.
XII. Disassembly of 1900/P Series Safety Valves
Depth
Micrometer
Dimension
A
Adjusting
Screw
Spindle
Vise
Bellows Ring
Disc Holder
Bellows
Convolutions
Spanner Wrench
Soft Material
Bellows Gasket
Figure 10
Figure 11: Removing the Bellows Ring
